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Exchange 2010 Receive Connector

Trying to get to the bottom of why attachments of c8mb are being bounced back by what seems to be our exchange server(s).
The mail is being received by our cloud mail partner.
Error:

552 5.3.4 Message size exceeds fixed maximum message size      

Exchange receive connectors are set to 10mb.
THere is no attachment size policy in the cloud.

2x Exch SP3 Ud6.

Ideas?
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Mark Galvin
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ASKER

think ive cracked it.
i wanted to know why before i changed settings.

i see attachments increase by 33% so may be why.

will increase transport etc..
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ASKER

right, changed what i thought was all i need to change - from 10mb to 25mb.
Not working.  Do i need to restart transport service?

THe internal and external dnsmaxmessageattachsize still showing 10mb...
You should restart the transport service and then check again.